org.apache.hadoop.hdfs.server.namenode.ha
Class WrappedFailoverProxyProvider<T>

java.lang.Object
  org.apache.hadoop.hdfs.server.namenode.ha.AbstractNNFailoverProxyProvider<T>
      org.apache.hadoop.hdfs.server.namenode.ha.WrappedFailoverProxyProvider<T>

All Implemented Interfaces:

Closeable, org.apache.hadoop.io.retry.FailoverProxyProvider<T>

public class WrappedFailoverProxyProvider<T>
extends AbstractNNFailoverProxyProvider<T>

A NNFailoverProxyProvider implementation which wrapps old implementations directly implementing the FailoverProxyProvider interface. It is assumed that the old impelmentation is using logical URI.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.hadoop.io.retry.FailoverProxyProvider

org.apache.hadoop.io.retry.FailoverProxyProvider.ProxyInfo<T>

Field Summary

Fields inherited from class org.apache.hadoop.hdfs.server.namenode.ha.AbstractNNFailoverProxyProvider

fallbackToSimpleAuth

Constructor Summary

WrappedFailoverProxyProvider(org.apache.hadoop.io.retry.FailoverProxyProvider<T> provider)
Wrap the given instance of an old FailoverProxyProvider.

Method Summary

void	close() Close the proxy,
Class<T>	getInterface()
org.apache.hadoop.io.retry.FailoverProxyProvider.ProxyInfo<T>	getProxy()
void	performFailover(T currentProxy)
boolean	useLogicalURI() Assume logical URI is used for old proxy provider implementations.

Methods inherited from class org.apache.hadoop.hdfs.server.namenode.ha.AbstractNNFailoverProxyProvider

setFallbackToSimpleAuth

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

WrappedFailoverProxyProvider

public WrappedFailoverProxyProvider(org.apache.hadoop.io.retry.FailoverProxyProvider<T> provider)

Wrap the given instance of an old FailoverProxyProvider.

Method Detail

getInterface

public Class<T> getInterface()

getProxy

public org.apache.hadoop.io.retry.FailoverProxyProvider.ProxyInfo<T> getProxy()

performFailover

public void performFailover(T currentProxy)

close

public void close()
           throws IOException

Close the proxy,

Throws:

IOException

useLogicalURI

public boolean useLogicalURI()

Assume logical URI is used for old proxy provider implementations.

Specified by:

useLogicalURI in class AbstractNNFailoverProxyProvider<T>

Returns:

true if logical HA URI is used. false, if not used.